Pump for elevating and dispensing liquids



May 17, 1927.

F. w. MITCHELL PUMP FOR ELEV-TING AND DISPENSING LIQUIDS Filed May 9. 1925 2 Sheets-Sheet l *l mar INVENTDR Ww F. W. MITCHELL PUMP FOR ELEVATING AND DISPENSING LIQUIDS I May 17 1927.

2 Sheets-Sheet 2 Filed May 9. 1925 INVENTDR Dff 5, is split at its lower end at two points, these split portions being bent outward so -as to forni a retainer for string. It is evident that by wrapping string about the piston rod and between the bent out porti-ons ot the rod 5a, that a piston will result. It is` also evident that the greater the amount ot string wrapped in this manner, that theV tighter the trictionalv resistance will be betweenthe member 6 and the piston. The purpose ot this frictional resistance is as K hereinafter disclosed.v y y Y yThe operation o'l the device is as tollows: Liquid to be dispensed is fed into the l container 1', to 'some suitable level, such as 2-I2 in the Vpresent instance.` The cover 3, containing the pumpingmechanism is then vfastened to the topot the container.

Thepiston' rod 5a, is then pulled in the upward direction of the' arrow Al0, (Fig. 4).

' TheV iirst portion ot this upward travel of the piston rod will cause the tube 6, by virtue of its frictional Contact with the piston 5,

Vto also move upward, until its upward movement-is stopped by reasonot its upper end coming into contact with the stop plate 8.

In'. this position of the tube member, wheny vin contact with theplate 8,*it is raised from contact with" the plate 9,'and a passage is thereby opened so that liquid permitted to flow from the container to the tubular mem- -ber 6. It is evident .thatwith a stopping of the upward lmovement of the member 6, and upon ajfurther movement upward of the piston, vthat liquid will be drawn from the container tothe tubular member 6. This continuation of the upward travel of therpistonA is'v permitted reason lof the i Vfrictional resistance between the piston and theftubul'ar member being overcome, by additional energy applied tothe piston rod.

Uponca. downward movement ofthe piston rod 5, in the direction of the arrow 12 (Fig. 5), the tir-st portion of said downward movement will beutilized to return member 6 into contact with the plate 9, or into the position shown in Figure l. Liquid previously drawn into the tubular member 6, by

Y the upward `stroke ofv the piston 1s now It is evident that as thc piston is elevated, and liquid is vdrawn from the con.

-. tainer, tothe vtubular member 6, that with l theV port" 4 uncovered, liquid disposed Vtrapped between the plate 9 and the piston.

Upon aY continuationlof theydownward movement *of the Vpiston this liquid is thenjtorced intoA the center of tube 4, thru the port 4a,

and discharged at the upper end oi? the 'tube 4, or elevated in said tube 4, kuntil successive operation-s ofthe piston hasrezlevatedr suliicient Vhquidfto cause-a delivery .from end ot from previous operations of the piston, in tube-4, will also tendr to bev withdrawn back into member., This condition howthe stop plate S.

. from my invention.

ever is substantially overcome by making the area of the port 4a, much smaller than the area of the opening produced by elevating the 'member 6 into contact with areas, av much greater amount ot liquid will be drawn from the container, than from the tube 4, at each upward stroke of the pistonpV and it is then evident that the lowering of the piston will force this greater amount of liquid intotube 4, and that upon suliicient .operation of the pistonsuliicient liquid `will be elevated to'x cause delivery from npper'end of tube 4. With the form of my invention it is also evident that tube 4 vcan be made of lVith this difference in a sufficiently small diameter so, thatliqui'ds Y forced `therein willY remain suspendedY Aby reason of capillary attraction vand partial vacuum created yby movement of'materials heavier than air so that delivery under these conditions will become very efficient, but-in any event I wish it understood,.that'it -is only required that 'the port 4a, be ot sufficient smallness so as to partially serve theV functions of a check valve', to effect.V delivery. f Y i It is evi-dent that `upon a return ofj the character itv is, customary to apply nozzles ofk esk 1GO Y varying types and designs, at the pointl of i.

the pumping means where-delivery occurs. However these being means vcommon lto the art toV which myinvention appertains, 'I

have not shownor otherwise described vsame,

ask they form no part ofjmy present invention. Y

I wish it und'erstood,that the 'particular device and the different parts thereof illustrated and described, are merely typical .em-

bodiment of one ormot my vinvention and that the specific construction described herein, ismerely by way of illustration, as obviously a great many changes in construction land design can be'made without departing Also, various' of the features. described can be omitted, leaving the device operativeto usefully ydo certain of the work described, and such changes are contemplated by me, and would not involve Y anyfdep'arture from my invention.

Y Having thus described my invention, what` I claim as new, and desire to secure by Let-2 ters Patent, is

1. In combination, a receptacle having ak vdischarge spout,'a piston lmounted on and surrounding the spout, a cylinder around A"the piston and movable Arelativethereto on interruptionl of the cylinder. serving tol iso Y charge theoylnder or to eject the charge serving to ycharge the'eylinder or to eject therefrom through the spout. thefcharge therefromthrough the spout, the

2. In combination, a receptacle having n spout having an opening therein near the .10 f.

discharge spout, a piston mounted on and bottom of the cylinder. 5 surrounding the spout, a cylinder around thev v 'In testimony'whereof' aiixvmy signature; y piston and movable relative thereto when 1' on interruption of movement of the cylinder Y *i i ,FREDERICK W. MITCHELLV 

